Prediction of the confidence interval for stability analysis of chain pillars in coal mines

Najafi, Mohammad; Jalali, Seyed‐Mohammad Esmaeil; Bafghi, A R Yarahmadi; Sereshki, Farhang

doi:10.1016/j.ssci.2010.11.005

Cited by 29 publications

(13 citation statements)

References 14 publications

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“…The entries roof after excavation is supported by rockbolt. In the hanging wall and footwall of coal seam, layers of sandstone, siltstone and mudstone can be seen [8][9]. The stratigraphy column in TCM is shown in Fig.…”

Section: Case Studymentioning

confidence: 99%

Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

Yaghoobi

Rafiee

Najafi

2019

anm

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KeywordsAbstract Selecting a suitable pillar recovery method is one of the most important issues in the room and pillar mining. The main purpose of this study is to compare two methods for pillar recovery in Tabas central coal mine (TCM). Among the existing methods, the two methods, "Modified split and fender" and "Shortwall" are chosen for the numerical modeling. The three dimensional finite difference method (FLAC3D software) is used to model these methods. In the next step, the vertical stress and displacement, the plastic zone condition and the safety factor during each stage of pillar recovery were compared for each method. The results of this modeling show that the percentages of coal recovery for two methods of "modified split and fender" and "shortwall" are around 70% and 82% respectively. Comparing the percentage recovery of coal for these two methods, exhibits that the shortwall method is more suitable than modified split and fender, for this mine. Room and Pillar Pillar Recovery Coal Mine Modified Split and FenderShortwall Mining FLAC3D Software

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Section: Case Studymentioning

confidence: 99%

Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

Yaghoobi

Rafiee

Najafi

2019

anm

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show abstract

“…Coates [1] defined the pillars as "the in-situ rock between two or more underground openings". Their primary purpose is to provide safe access to the working area and to support the weight of overburden material between adjacent underground openings temporarily or permanently, and drilling room of ceilings during excavation and mining [2][3][4][5][6][7]. Instable pillars may significantly increase workers' safety hazards and sudden roof collapse [8].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Pillar Stability of Underground Mines with Random Trees and C4.5 Decision Trees

et al. 2020

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Predicting pillar stability in underground mines is a critical problem because the instability of the pillar can cause large-scale collapse hazards. To predict the pillar stability for underground coal and stone mines, two new models (random tree and C4.5 decision tree algorithms) are proposed in this paper. Pillar stability depends on the parameters: width of the pillar (W), height of the pillar (H), W/H ratio, uniaxial compressive strength of the rock (σucs), and pillar stress (σp). These parameters are taken as input variables, while underground mines pillar stability as output. Various performance indices, i.e., accuracy, precision, recall, F-measure, Matthews correlation coefficient (MCC) were used to evaluate the performance of the models. The performance evaluation of the established models showed that both models were able to predict pillar stability with reasonable accuracy. Results of the random tree and C4.5 decision tree were also compared with available models of support vector machine (SVM) and fishery discriminant analysis (FDA). The results show that the proposed random tree provides a reliable and feasible method of evaluating the pillar stability for underground mines.

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“…A short‐wall mining method has the advantages of combined mining and driving processes, as well as high adaptability, etc Therefore, short‐wall mining methods have been applied to the mining of boundary coal pillars, and the recovery of residual pillars in mines. The main global mining countries have attached great importance to short‐wall mining methods, and Chinese and international researchers have carried out thorough related studies.…”

Section: Introductionmentioning

confidence: 99%

A study of the dynamic movement rule of overlying strata combinations using a short‐wall continuous mining and full‐caving method

Wen

Cheng

Chen

et al. 2019

Energy Science & Engineering

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At present in China, short-wall working face coal-mining methods are among the main methods used for the high-efficiency recoveries of boundary coal pillars and residual pillars. In traditional short-wall mining methods, overlying roofs are supported by coal pillars. However, issues such as the excessive number of coal pillars, low coal recovery efficiency, large areas of hanging roof arches, etc, have been encountered. In view of the aforementioned issues of the current short-wall mining technology, this study took the short-wall mining of the Yujialiang Mine in the Shendong mining area as the project background. The study then proposed a judgment method for the key stratum on the working face of the mine using a short-wall continuous mining and full-caving method. The proposed method was based on the theory of elastic plates and was verified using the theoretical analysis results of similar material simulation experiments. FLAC 3D software was adopted to analyze the stress and displacement evolution processes of the overlying rock strata during the advancement of the working face using a short-wall continuous mining and full-caving method. The results showed that the short-wall continuous mining and full-caving method not only had the ability to improve the recovery rate, but was also able to realize the effective control of the roof areas, thereby avoiding any large areas of hanging arches. The short-wall continuous mining and full-caving method is potentially of important significance for the improvement of coal recovery rates, as well as for the safe and highly efficient mining of boundary coal pillars and residual pillars in mines under special conditions. K E Y W O R D Scaving span, composite key stratum, numerical simulation, short-wall continuous mining and full caving, similar material simulation experiment | 2985 WEN Et al.

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Prediction of the confidence interval for stability analysis of chain pillars in coal mines

Cited by 29 publications

References 14 publications

Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

Comparing the “Modified Split and Fender” and “Shortwall” Methods for the Pillar Recovery in Room and Pillar Coal Mining Using A 3D Finite Difference Modeling in Tabas Central Coal Mine, Iran

Predicting the Pillar Stability of Underground Mines with Random Trees and C4.5 Decision Trees

A study of the dynamic movement rule of overlying strata combinations using a short‐wall continuous mining and full‐caving method

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